Dynamic PAMT Merged For Linux 7.4 To Help Intel Servers Save Precious RAM
Curated from Phoronix
If you manage large fleets of Intel TDX confidential computing instances, this kernel update addresses a persistent infrastructure pain point. Traditional static memory allocation for PAMT tables can become a significant overhead when your hypervisor hosts few concurrent virtual machines, effectively wasting gigabytes of high-cost DRAM. With commodity memory prices climbing and supply chains remaining volatile, optimizing the memory footprint of your host OS is no longer just a theoretical best practice; it is a direct cost-saving measure. This feature allows the kernel to scale these tables dynamically based on actual VM density, rather than reserving space for a worst-case scenario that may never materialize. For platform engineers, this reduces the baseline memory tax of running confidential workloads on modern Xeon hardware. Takeaway: Audit your current TDX host configurations to determine if your typical VM density qualifies for dynamic PAMT benefits, potentially freeing up several gigabytes of RAM per node for application workloads.
Dynamic PAMT has made it for Linux 7.4! Dynamic PAMT is a new feature for reducing memory overhead on Intel TDX servers where there may not be many concurrent virtual machines occupying a majority of the system. In today's world with high memory prices and tight availability, Dynamic PAMT provides nice memory overhead reduction for modern Intel Xeon servers...
— Phoronix